Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D90/00—Component parts, details or accessories for large containers
  • B65D90/02—Wall construction
  • B65D90/04—Linings
  • B65D90/046—Flexible liners, e.g. loosely positioned in the container
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B1/00—Layered products having a non-planar shape
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
  • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/06—Polyethylene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
  • C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/03—3 layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/24—All layers being polymeric
  • B32B2250/242—All polymers belonging to those covered by group B32B27/32
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/54—Yield strength; Tensile strength
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/558—Impact strength, toughness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/58—Cuttability
  • B32B2307/581—Resistant to cut
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/72—Density
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/40—Closed containers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/40—Closed containers
  • B32B2439/62—Boxes, cartons, cases
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/70—Food packaging
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
  • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
  • C08J2323/04—Homopolymers or copolymers of ethene
  • C08J2323/06—Polyethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
  • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
  • C08J2323/04—Homopolymers or copolymers of ethene
  • C08J2323/08—Copolymers of ethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/16—Applications used for films
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
  • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Definitions

• the present invention relates to container liner for holding liquids, wherein the container liner comprises a film that comprises polyethylene materials.
• a particular manner in which efficiency improvement is pursued is by using of standardised units for transporting goods.
• Such transportation units which are well known as intermodal containers or shipping containers, have such standardised dimensions and design that it is possible to transport them using a large variety of transportation means, including ships, trucks and trains, without having to make any adjustment to the transportation means to allow safe and secure fitting of the containers onto the transportation means. That is, the containers are of such dimensions that a given truck, train or ship, designed for intermodal container transportation, can take on the vast majority of available containers. This makes is easy and efficient to transport goods, which only have to be loaded into a container once and then can be transported using several transportation means. By so, goods can be transported from one place to the other with minimised handling.
• the intermodal containers are so-called ‘dry freight’ containers, in the form of a box-type container with doors at one end, and corrugated steel walls. Whilst being perfectly suitable for holding many types of dry freight, they cannot be used per se for transporting liquid goods, since they are not liquid-tight. When such containers are to be used to transport liquid goods, these liquid goods need to be provided in a further container to ensure that the goods are stored securely. Such further container may then be placed into the intermodal container.
• a container liner for holding liquid goods wherein the liner comprises a film comprising one or more layers, wherein at least one of said layers is a layer L1 comprising
• Such container liner demonstrates a desirably high flex resistance, combined with a high dart impact resistance, and a high tensile strength.
• the flex crack resistance of the liner may be determined by subjecting samples of the liner, for example samples of the film comprised in the liner, to a test in accordance with ASTM F392-93 (2004), which may also be referred to as a Gelbo flex test. In this test, the samples are subjected to a pre-defined number of flexural cycles, upon which the number of pinholes in the film is determined, as prescribed by ASTM F392-93 (2004). The less pinholes identified, the higher the flex crack resistance.
• the dart impact resistance may be determined as the impact failure weight by subjecting samples of the liner, for example samples of the film comprised in the liner, to a test in accordance with ASTM D1709 (2009), method A.
• the invention relates to a container liner wherein the polyethylene plastomer P2 has:
• CCDB is determined according to formula I:
• T n - 2 ⁇ w ⁇ ( i ) T ⁇ ( i ) 2 ⁇ w ⁇ ( i ) T ⁇ ( i ) 3 formula ⁇ II
• T z + 2 ⁇ w ⁇ ( i ) ⁇ T ⁇ ( i ) 4 ⁇ w ⁇ ( i ) ⁇ T ⁇ ( i ) 3 formula ⁇ III
• the melt mass flow rate is determined in accordance with ISO 1133-1 (2011), at 190° C., and expressed in g/10 min.
• the melt mass flow rate may be determined using a load of 2.16 kg, then referred to as MFR2, or using a load of 5.0 kg, then referred to as MFR5.
• the density of the polymer materials is determined in accordance with ASTM D1505 (2010), and expressed in kg/m 3 .
• specimens may be used as prepared in accordance with ISO 17855-2 (2016).
• the DMS measurements were carried out according to ISO 6721-10 (2015) at 190° C.
• analytical temperature rising elution fractionation also referred to as a-TREF
• a-TREF Polymer Char Crystaf-TREF 300 equipped with stainless steel columns having a length of 15 cm and an internal diameter of 7.8 mm, with a solution containing 4 mg/ml of sample prepared in 1,2-dichlorobenzene stabilised with 1 g/l Topanol CA (1,1,3-tri(3-tert-butyl-4-hydroxy-6-methylphenyl)butane) and 1 g/l Irgafos 168 (tri(2,4-di-tert-butylphenyl) phosphite) at a temperature of 150° C. for 1 hour.
• Topanol CA 1,1,3-tri(3-tert-butyl-4-hydroxy-6-methylphenyl)butane
• Irgafos 168 tri(2,4-di-tert-butylphenyl) phosphite
• the solution may be further stabilised for 45 minutes at 95° C. under continuous stirring at 200 rpm before analyses.
• the solution was crystallised from 95° C. to 30° C. using a cooling rate of 0.1° C./min.
• Elution may be performed with a heating rate of 1° C./min from 30° C. to 140° C.
• the set-up may be cleaned at 150° C.
• the sample injection volume may be 300 ⁇ l, and the pump flow rate during elution 0.5 ml/min.
• the volume between the column and the detector may be 313 ⁇ l.
• the fraction that is eluted at a temperature of ⁇ 30.0° C. may in the context of the present invention be calculated by subtracting the sum of the fraction eluted >30.0° C. from 100%, thus the total of the fraction eluted ⁇ 30.0° C., and the fraction eluted >30.0° C. to add up to 100.0 wt %.
• a-TREF may be carried out using a Polymer Char Crystaf-TREF 300 using a solution containing 4 mg/ml of the polymer in 1,2-dichlorobenzene, wherein the solution is stabilised with 1 g/l 1,1,3-tri(3-tert-butyl-4-hydroxy-6-methylphenyl)butane and 1 g/l tri(2,4-di-tert-butylphenyl) phosphite) at a temperature of 150° C. for 1 hour, and further stabilised for 45 minutes at 95° C. under continuous stirring at 200 rpm, wherein the prior to analyses the solution is crystallised from 95° C. to 30° C. using a cooling rate of 0.1° C./min, and elution is performed at a heating rate of 1° C./min from 30° C. to 140° C., and wherein the equipment has been cleaned at 150° C.
• the invention also relates to a container liner wherein the film comprises at least three layers A/B/C or consists of three layers A/B/C, wherein the layer A is in direct contact with the layer B, and the layer B is in direct contact with the layer C, preferably wherein the composition of the layer A is the same as the composition of the layer C.
• the layer B may be a layer L1, preferably the layer B may be a layer L1.
• the film may for example comprise ⁇ 2.5 wt %, more preferably ⁇ 2.5 and ⁇ 10.0 wt %, of a high-density polyethylene having a density of >945 and ⁇ 965 kg/m 3 , as determined in accordance with ASTM D1505 (2010), preferably wherein the high-density polyethylene is a bimodal high density polyethylene.
• the layer L1 may comprise a fraction of a high-density polyethylene, preferably having a density of >945 and ⁇ 965 kg/m 3 .
• the layer L1 comprises ⁇ 2.5 and ⁇ 15.0 wt %, or ⁇ 5.0 and ⁇ 12.5 wt %, of a high-density polyethylene, preferably wherein the high-density polyethylene has a density of >945 and ⁇ 965 kg/m 3 , more preferably >950 and ⁇ 960 kg/m 3 .
• the high-density polyethylene may for example have an MFR2 of >0.01 and ⁇ 5.0 g/10 min, preferably >0.1 and ⁇ 2.0 g/10 min.
• the high-density polyethylene may have an MFR5 of >1.0 and ⁇ 25.0 g/10 min, preferably >5.0 and ⁇ 15.0 g/10 min.
• the high-density polyethylene may for example be a homopolymer of ethylene.
• the high-density polyethylene may be a copolymer of ethylene and a comonomer selected from 1-butene, 1-hexene and 4-methyl-1-pentene.
• the high-density polyethylene may be a copolymer comprising moieties derived from ethylene and ⁇ 0.1 and ⁇ 5.0 wt %, preferably ⁇ 0.2 and ⁇ 4.0 wt %, more preferably ⁇ 0.5 and ⁇ 3.0 wt %, of moieties derived from a comonomer selected from 1-butene, 1-hexene and 4-methyl-1-pentene, with regard to the total weight of the high-density polyethylene.
• the high-density polyethylene may be a copolymer comprising ⁇ 90.0, preferably ⁇ 95.0, more preferably ⁇ 96.0, even more preferably ⁇ 97.0 wt %, of moieties derived from ethylene, and ⁇ 0.1 and ⁇ 5.0 wt %, preferably ⁇ 0.2 and ⁇ 4.0 wt %, more preferably ⁇ 0.5 and ⁇ 3.0 wt %, of moieties derived from a comonomer selected from 1-butene, 1-hexene and 4-methyl-1-pentene, with regard to the total weight of the high-density polyethylene.
• the high-density polyethylene may for example be produced in a gas-phase polymerisation process or in a slurry polymerisation process.
• the high-density polyethylene may for example be produced using a Ziegler-type catalyst or using a Phillips-type chromium-based catalyst.
• the film may for example have a thickness of ⁇ 100 ⁇ m, preferably ⁇ 100 and ⁇ 1000 ⁇ m.
• the film may for example have a density of ⁇ 912 kg/m 3 , as determined in accordance with ASTM D1505 (2010), preferably of >900 and ⁇ 912 kg/m 3 .
• the container liner has such dimensions allowing to contain a liquid volume of between 1.0 and 30.0 m 3 , preferably of between 1.0 and 5.0 m 3 , or of between 10.0 and 30.0 m 3 .
• the container liner further comprises at least one closable opening for filling and/or evacuating the liner, preferably the liner comprises a closable opening for filling and evacuating the liner.
• the present invention also relates to a transportation unit comprising a container liner according to the invention, particularly wherein the container liner comprises a volume of liquid goods.
• liquid goods may for example be selected from potable liquids such as beverages, syrups, oils, fats, vinegars, and detergents.
• liquid goods may be chemical compounds or formulations.
• Such transportation unit may for example be a box, preferably a cardboard box, or an intermodal container.
• the invention also relates to the use of a film comprising one or more layers, wherein at least one of said layers is a layer L1 comprising
• the polyethylene P1 may for example be a linear low-density polyethylene.
• the polyethylene P1 is a copolymer of ethylene and 1-octene.
• the polyethylene P1 may comprise ⁇ 80.0 wt %, preferably ⁇ 85.0 wt %, of moieties derived from ethylene, with regard to the total weight of the polyethylene.
• polyethylene P1 may comprise ⁇ 80.0 wt %, preferably ⁇ 85.0 wt %, of moieties derived from ethylene, with regard to the total weight of the polyethylene, and moieties derived from 1-octene.
• the polyethylene P1 may comprise moieties derived from ethylene and ⁇ 20.0 wt %, preferably ⁇ 15.0 wt %, of moieties derived from 1-octene, with regard to the total weight of the polyethylene.
• the polyethylene P1 may comprise moieties derived from ethylene and >0.0 and ⁇ 20.0 wt %, preferably >0.0 and ⁇ 15.0 wt %, of moieties derived from 1-octene.
• the polyethylene P1 may comprise moieties derived from ethylene and >5.0 and ⁇ 20.0 wt %, preferably >10.0 and ⁇ 20.0 wt %, more preferably >10.0 and ⁇ 15.0 wt %, of moieties derived from 1-octene, with regard to the total weight of the polyethylene.
• the invention relates to a container liner for holding liquid goods, wherein the liner comprises a film comprising one or more layers, wherein at least one of said layers is a layer L1 comprising
• the polyethylene P1 may have a number average molecular weight (M n ) of ⁇ 25.0, preferably ⁇ 30.0 kg/mol, for example ⁇ 25.0 and ⁇ 45.0, preferably ⁇ 30.0 and ⁇ 40.0 kg/mol.
• M n number average molecular weight
• the polyethylene P1 may have a weight average molecular weight (M w ) of ⁇ 70.0 kg/mol, preferably ⁇ 85.0 kg/mol, preferably ⁇ 70.0 and ⁇ 125.0, more preferably ⁇ 85.0 and ⁇ 115 kg/mol.
• the polyethylene P1 may have a z-average molecular weight (M z ) of ⁇ 500, preferably ⁇ 400 kg/mol, for example ⁇ 150 and ⁇ 500 kg/mol, preferably ⁇ 200 and ⁇ 400 kg/mol.
• the polyethylene P1 may for example have an M w /M n ratio of ⁇ 2.0 and ⁇ 4.0, preferably ⁇ 2.5 and ⁇ 3.5.
• the polyethylene P1 may for example have an M z /M n ratio of ⁇ 25.0, preferably ⁇ 20.0, for example ⁇ 5.0 and ⁇ 25.0, preferably ⁇ 5.0 and ⁇ 20.0, more preferably ⁇ 5.0 and ⁇ 15.0.
• M n is the number average molecular weight
• M w the weight average molecular weight
• M z the z-average molecular weight
• the polyethylene P1 may for example be produced in a gas-phase polymerisation process, a slurry polymerisation process, or a solution polymerisation process.
• the polyethylene P1 may for example be produced in a gas-phase polymerisation process, a slurry polymerisation process, or a solution polymerisation process, in the presence of a single-site type catalyst.
• the polyethylene P1 may for example be produced in a gas-phase polymerisation process, a slurry polymerisation process, or a solution polymerisation process, in the presence of a metallocene-type catalyst.
• the polyethylene P1 may be produced in a gas-phase polymerisation process in the presence of a single-site type catalyst, preferably a metallocene-type catalyst.
• a single-site type catalyst preferably a metallocene-type catalyst.
• the polyethylene P1 may be produced in a slurry polymerisation process in the presence of a single-site type catalyst, preferably a metallocene-type catalyst.
• the polyethylene P1 may be produced in a solution polymerisation process in the presence of a single-site type catalyst, preferably a metallocene-type catalyst.
• the polyethylene P1 may be produced in a polymerisation process comprising a single polymerisation reactor, or alternatively in a polymerisation process comprising multiple reactors positioned in series.
• the polyethylene P1 may be produced in a polymerisation process comprising two or three reactors positioned in series, such as two reactors positioned in series.
• the reaction product from a preceding reactor is introduced into a subsequently positioned reactor, together with further monomers.
• the further monomers may be ethylene and/or 1-octene.
• the polyethylene P1 may be produced in a solution polymerisation process comprising two or three reactors positioned in series.
• the polyethylene plastomer P2 may for example have a fraction of material that is eluted in a-TREF at a temperature of ⁇ 30.0° C. of ⁇ 5.0 wt % with regard to the total weight of the polyethylene, preferably ⁇ 7.5 wt %, more preferably ⁇ 10.0 wt %, even more preferably ⁇ 11.5 wt %.
• polyethylene plastomer P2 has a fraction of material that is eluted in a TREF at a temperature of ⁇ 30.0° C.
• the polyethylene plastomer P2 may for example have a CCDB of ⁇ 15.0, preferably ⁇ 17.5, more preferably ⁇ 20.0.
• the polyethylene plastomer P2 may have a CCDB of ⁇ 15.0 and ⁇ 30.0, preferably ⁇ 17.5 and ⁇ 25.0, more preferably ⁇ 20.0 and ⁇ 25.0.
• the polyethylene plastomer P2 comprises ⁇ 70.0 wt % of moieties derived from ethylene, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 75.0 wt %, more preferably ⁇ 80.0 wt %.
• the polyethylene plastomer P2 comprises ⁇ 70.0 and ⁇ 98.0 wt %, more preferably ⁇ 75.0 and ⁇ 95.0 wt %, even more preferably ⁇ 80.0 and ⁇ 90.0 wt % of moieties derived from ethylene, with regard to the total weight of the polyethylene plastomer.
• the polyethylene plastomer P2 comprises ⁇ 30.0 wt % of moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 25.0 wt %, more preferably ⁇ 20.0 wt %.
• the polyethylene plastomer may for example comprise ⁇ 5.0 wt % of moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 10.0 wt %, more preferably ⁇ 15.0 wt %.
• the polyethylene plastomer may comprise ⁇ 5.0 and ⁇ 30.0 wt % of moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 10.0 wt % and ⁇ 25.0 wt %, more preferably ⁇ 15.0 and ⁇ 20.0 wt %.
• the ⁇ -olefin may comprising 4-10 carbon atoms for example be selected from 1 butene, 1-hexene, 4-methyl-1-pentene, and 1-octene, such as from 1-butene, 1-hexene and 1-octene.
• the ⁇ -olefin comprising 4-10 carbon atoms may be selected from 1-hexene and 1-octene.
• the moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms may for example be moieties derived from 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, or combinations thereof, preferably from 1-hexene or 1-octene, most preferably 1-octene.
• the polyethylene plastomer P2 may for example comprise ⁇ 30.0 wt % of moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 25.0 wt %, more preferably ⁇ 20.0 wt %, wherein the ⁇ -olefin comprising 4-10 carbon atoms is selected from 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene, such as from 1-butene, 1-hexene and 1-octene.
• the polyethylene plastomer may for example comprise ⁇ 5.0 wt % of moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 10.0 wt %, more preferably ⁇ 15.0 wt %, wherein the ⁇ -olefin comprising 4-10 carbon atoms is selected from 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene, such as from 1-butene, 1-hexene and 1-octene.
• the polyethylene plastomer may comprise ⁇ 5.0 and ⁇ 30.0 wt % of moieties derived from an ⁇ -olefin comprising 4-10 carbon atoms, with regard to the total weight of the polyethylene plastomer, preferably ⁇ 10.0 wt % and ⁇ 25.0 wt %, more preferably ⁇ 15.0 and ⁇ 20.0 wt %, wherein the ⁇ -olefin comprising 4-10 carbon atoms is selected from 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene, such as from 1-butene, 1-hexene and 1-octene.
• the polyethylene plastomer P2 may for example be produced via a solution polymerisation process, preferably by polymerisation of ethylene with 1-hexene and/or 1-octene.
• the polyethylene plastomer may for example be produced using a metallocene-type catalyst, preferably by polymerisation of ethylene with 1-hexene and/or 1-octene.
• the film as comprised in the container liner of the invention may comprise a fraction of low-density polyethylene.
• the film may comprise ⁇ 2.5 and ⁇ 15.0 wt % of the low-density polyethylene, with regard to the total weight of the film.
• the layer L1 may comprise ⁇ 2.5 and ⁇ 15.0 wt % of a low-density polyethylene. It is preferred that the low-density polyethylene has a density of >900 and ⁇ 935 kg/m 3 , more preferably >910 and ⁇ 930 kg/m 3 , even more preferably >915 and ⁇ 925 kg/m 3 .
• the low-density polyethylene is a polyethylene produced via free-radical polymerisation of a reaction mixture comprising ethylene, preferably consisting of ethylene as the sole reactant.
• the low-density polyethylene may be a homopolymer.
• the low-density polyethylene may be produced using a high-pressure polymerisation process, such as using a high-pressure tubular polymerisation process or using a high-pressure autoclave polymerisation process, preferably wherein the pressure in the polymerisation reactor is >150 MPa, such as >150 and ⁇ 300 MPa, more preferably >200 and ⁇ 300 MPa.
• the low-density polyethylene has an a melt mass flow rate of ⁇ 0.1 and ⁇ 5.0 g/10 min, preferably of ⁇ 0.5 and ⁇ 2.0 g/10 min, as determined in accordance with ISO 1133-1 (2011) at 190° C. using a load of 2.16 kg.
• the invention relates to a container liner wherein the layer L1 comprises ⁇ 2.5 and ⁇ 15.0 wt % of a low-density polyethylene, preferably wherein the low-density polyethylene has a density of >900 and ⁇ 935 kg/m 3 , preferably wherein the low-density polyethylene is a polyethylene produced via free-radical polymerisation of a reaction mixture comprising ethylene, wherein preferably the low-density polyethylene has an a melt mass flow rate of ⁇ 0.1 and ⁇ 5.0 g/10 min, preferably of ⁇ 0.5 and ⁇ 2.0 g/10 min, as determined in accordance with ISO 1133-1 (2011) at 190° C. using a load of 2.16 kg.
• the film as comprised in the container liner comprises at least three layers A/B/C or consists of three layers A/B/C, wherein the layer A is in direct contact with the layer B, and the layer B is in direct contact with the layer C, wherein:
• the film as comprised in the container liner comprises at least three layers A/B/C or consists of three layers A/B/C, wherein the layer A is in direct contact with the layer B, and the layer B is in direct contact with the layer C, wherein:
• the film as comprised in the container liner comprises at least three layers A/B/C or consists of three layers A/B/C, wherein the layer A is in direct contact with the layer B, and the layer B is in direct contact with the layer C, wherein:
• the film as comprised in the container liner comprises at least three layers A/B/C or consists of three layers A/B/C, wherein the layer A is in direct contact with the layer B, and the layer B is in direct contact with the layer C, wherein:
• the film as comprised in the container liner may comprise at least three layers A/B/C or may consist of three layers A/B/C, wherein the layer A is in direct contact with the layer B, and the layer B is in direct contact with the layer C, wherein:
• the layer A may have a thickness of ⁇ 10.0 and ⁇ 50.0 ⁇ m, preferably ⁇ 20.0 and ⁇ 40.0 ⁇ m.
• the layer C may have a thickness of ⁇ 10.0 and ⁇ 50.0 ⁇ m, preferably ⁇ 20.0 and ⁇ 40.0 ⁇ m.
• the layer B may have a thickness of ⁇ 25.0 and ⁇ 75.0 ⁇ m, preferably ⁇ 40.0 and ⁇ 60.0 ⁇ m.
• the layer A may have a thickness of ⁇ 10.0 and ⁇ 50.0 ⁇ m, preferably ⁇ 20.0 and ⁇ 40.0 ⁇ m
• the layer C may have a thickness of ⁇ 10.0 and ⁇ 50.0 ⁇ m, preferably ⁇ 20.0 and ⁇ 40.0 ⁇ m
• the layer B may have a thickness of ⁇ 25.0 and ⁇ 75.0 ⁇ m, preferably ⁇ 40.0 and ⁇ 60.0 ⁇ m.
• the film as comprised in the container liner may have a thickness of ⁇ 100 and ⁇ 1000 ⁇ m, preferably ⁇ 100 and ⁇ 300 ⁇ m, wherein the layer A constitutes ⁇ 20.0 and ⁇ 40.0 wt % and/or the layer B constitutes ⁇ 20.0 wt % and ⁇ 60.0 wt %, and/or the layer C constitutes ⁇ 20.0 and ⁇ 40.0 wt %, each with regard to the total weight of the film.
• a number of multilayer films for use in container liners were produced using the materials as listed in the table below.
• LLDPE1 Dow Elite 5401G a linear low-density ethylene/1-octene polyethylene copolymer having and MFR2 of 1.0 g/10 min and a density of 918 kg/m 3 LLDPE2
• SABIC Supeer 8112L a linear low-density ethylene/1-octene polyethylene copolymer produced via solution polymerisation using a metallocene catalyst, having an MFR2 of 1.0 g/10 min, and a density of 912 kg/m 3 LLDPE3 Dow Elite AT6101 LLDPE4 Dow Elite 5400G, a linear low-density ethylene/1-octene polyethylene copolymer having and MFR2 of 1.0 g/10 min and a density of 916 kg/m 3 LLDPE5 SABIC Supeer 8112, a linear low-density ethylene/1-octene polyethylene copolymer produced via solution polymerisation using a metallocene catalyst, having an MFR2 of 1.0
• a number of three-layer films were produced via multi-layer blown film extrusion, wherein a first outer layer was provided for by a first extruder, a core layer was provided for by a second extruder, and a second outer layer was provided for by a third extruder.
• Each of the extruders supplied material to a circular die having a diameter of 60 mm and a die gap of 2.0 mm.
• Each extruder was a single-screw extruder having a screw diameter of 25 mm.
• the blow-up ratio was 2.5.
• the total output of the combined extruders was 8 kg/h, wherein the first extruder provided 30% thereof to form the first outer layer, the second extruder provided 40% to form the core layer, and the third extruder provided 30% to form the second outer layer.
• the extruders were equipped with four barrel zones, and a die in which the layers were combined to form the multi-layer film.
• the temperature in the extruder zones was in each of the extruders as follows:
• Zone 1 feed zone 170° C.
• Zone 2 185° C.
• Zone 3 190° C.
• Zone 4 190° C. Die 190° C.
• films were produced having a thickness of 125 ⁇ m, according to the material formulations for each of the layers, and thus the feed compositions for each of the corresponding extruders, as presented here below.
• Second outer layer 1 90% LLDPE1 60% POP1 90% LLDPE1 10% LDPE 30% LLDPE4 10% LDPE 10% LDPE 2 90% LLDPE1 90% LLDPE3 90% LLDPE1 10% LDPE 10% LDPE 10% LDPE 3 90% LLDPE2 30% POP2 90% LLDPE2 10% LDPE 60% LLDPE5 10% LDPE 10% LDPE 4 90% LLDPE2 60% POP3 90% LLDPE2 10% LDPE 30% LLDPE5 10% LDPE 10% LDPE 5 90% LLDPE2 30% POP2 90% LLDPE2 10% LDPE 60% LLDPE5 10% LDPE 10% HDPE
• Example 1 2 3 4 5 Film density 914 914 911 911 911 911 911 911 Dart impact 2312 2480 2252 2552 2420 Tensile strength 42 48 53 56 50 MD Tensile strength TD 47 47 53 54 45 Modulus MD 139 153 128 136 128 Modulus TD 170 141 131 130 124 Puncture force 71.3 71.0 88.0 89.6 93.2 Puncture break 2.8 2.7 4.9 4.7 5.2 Pinhole count 4 5.5 3 2 0.5

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